Okay, presuming you don't have bad gasoline in your tank, then I'd have to say with multiple cylinder misfire errors, you have a complex problem with possibly multiple defects---I'm thinking something like a bad wiring harness, injector harness or ECM. You could also have a bad vacuum leak, fuel pressure drop, bad MAF sensor,
There is a complete diagnostic "tree" available at ALL DATA PRO
which any competent garage should be able to tap into and follow.
Or if you're up for it, for $26 a year, you can access ALL DATA DIY
, which has similar info, and this will allow you to access repair and spec data on just about any repair or component of your car for a whole year
Good luck--this is the best I can do for you with the information at hand.